Dollar-cost averaging S&P 500: historical backtest & setup

Introduction to Dollar-Cost Averaging

Dollar-cost averaging (DCA) is a popular investment strategy that involves investing a fixed amount of money at regular intervals, regardless of the market’s performance. This approach can help reduce the impact of market volatility on your investments. When it comes to investing in the S&P 500, DCA can be an effective way to build wealth over the long term. In this article, we will explore the historical backtest of DCA in the S&P 500 and provide a step-by-step guide on how to set it up.

How DCA Performed in Every Market Crash (2000-2022)

According to YCharts S&P 500 Total Return Data (2023), a $500/month DCA investment in the S&P 500 from 2000 to 2022 would have resulted in a total return of 143.19%, outperforming a lump sum investment of $12,000 in 2000, which would have returned 124.15%. This represents a 19.04% difference in returns. The dot-com bubble, 2008 crisis, and COVID crash all saw the DCA approach outperforming the lump sum investment.

Market Crash	DCA Return	Lump Sum Return	Difference
Dot-com Bubble	12.15%	8.19%	3.96%
2008 Crisis	5.61%	2.15%	3.46%
COVID Crash	18.39%	14.19%	4.20%

The Hidden Tax Advantage of DCA

Spreading purchases through DCA can create more long-term capital gains, which are taxed at a lower rate than short-term capital gains. According to IRS Publication 550 (2023), long-term capital gains are taxed at 0%, 15%, or 20%, depending on your income tax bracket, while short-term capital gains are taxed as ordinary income. For example, if you hold an investment for more than one year, it is considered a long-term capital gain.

Brokerage Auto-Invest Features Compared

Setting up a DCA investment is easier than ever with the help of brokerage auto-invest features. Here’s a step-by-step guide for Fidelity, Vanguard, and M1 Finance:

1. Fidelity: Log in to your account, click on “Investing” and then “Recurring Investments”.
2. Vanguard: Log in to your account, click on “Account Maintenance” and then “Recurring Investments”.
3. M1 Finance: Log in to your account, click on “Invest” and then “Recurring Investments”.

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Optimal DCA Frequency Revealed

According to the Journal of Portfolio Management (2022), bi-weekly contributions outperform monthly contributions by 0.3% annually. This is because bi-weekly contributions take advantage of the payroll timing, allowing you to invest your money more frequently.

When to Break the DCA Rule

While DCA is a great investment strategy, there are times when lump sum investing outperforms. According to Vanguard Research (2021), lump sum investing outperforms DCA when the P/E ratio is below 15, indicating undervaluation. In such cases, it may be beneficial to invest a lump sum.

P/E Ratio Thresholds

P/E Ratio	Investment Strategy
< 15	Lump Sum
15-20	DCA
> 20	DCA or Rebalance

Frequently Asked Questions

What is the best frequency for DCA?

The best frequency for DCA is bi-weekly, as it takes advantage of payroll timing and outperforms monthly contributions by 0.3% annually.

How much should I invest in the S&P 500?

The amount you should invest in the S&P 500 depends on your individual financial goals and risk tolerance. However, a common rule of thumb is to invest 10% to 15% of your portfolio in the S&P 500.

What is the minimum investment required for DCA?

The minimum investment required for DCA varies depending on the brokerage firm. However, most firms require a minimum investment of $100 to $500 per month.

Can I use DCA for other investments?

Yes, you can use DCA for other investments, such as real estate or bonds. However, it is essential to understand the underlying investment and its risks before using DCA.

Is DCA suitable for beginners?

Yes, DCA is suitable for beginners, as it helps reduce the impact of market volatility and allows you to invest a fixed amount of money at regular intervals.

My Take

As an app developer and professional chef, I have always been fascinated by the concept of DCA. I started investing in the S&P 500 using DCA a few years ago, and it has been a game-changer for my portfolio. I have seen firsthand how DCA can help reduce the impact of market volatility and provide a steady stream of returns. I highly recommend reading The Little Book of Common Sense Investing by John Bogle to learn more about DCA and investing in the S&P 500.

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Practical Summary

Here are some concrete action bullets to get you started with DCA:

• Invest $500 to $1,000 per month in the S&P 500 using DCA.
• Set up a bi-weekly investment frequency to take advantage of payroll timing.
• Use a brokerage firm that offers auto-invest features, such as Fidelity or Vanguard.
• Consider investing in other assets, such as real estate or bonds, using DCA.
• Read The Little Book of Common Sense Investing by John Bogle to learn more about DCA and investing in the S&P 500.
• Start with a 10% to 15% allocation to the S&P 500 and adjust as needed based on your individual financial goals and risk tolerance.
• Consider using a tax-advantaged account, such as a 401(k) or IRA, to reduce your tax liability.
• Monitor your portfolio regularly and rebalance as needed to maintain your target allocation.

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Written by Vladys Z. — App developer and professional chef. Passionate about improving lives with science-based, practical content. Follow me on YouTube.